You need to continue making regular car payments, maintain vehicle registration, and then transfer the car's ownership. You cannot drive the car unless you have proper registration, and penalties will be charged if this is not done on time.
You can find instructions specific to your relationship to the deceased by visiting the Maryland MDOT MVA website, which can be accessed here. You should have access to either a death certificate or form VR-278 or VR-264P to proceed.
Additionally, if you need assistance with the driver’s license, license plates, or disabled person placards for the deceased, click here.